Controlling mechanism



July 5 1927 F. D. HoLDswoRTH CONTROLLING MECHANISM Filed May 28. 1924 Patented July 5, 1927.

f UNITED STATES PATENT OFFICE.

ERED n. RoLnswoRTII, OE CLAREIvIONT, NEW HAMPSHIRE, AssIGNOR To .SULLIVAN MACHINERY COMPANY, A CORPORATION OE MASSACHUSETTS.

CONTROLLING MIEICHAN'ISINII.`

Application iiiea May l2s,

My invention relates to controlling mechanisms. l

An object of my invention is to provide an improved controlling mechanism. An; I other object of my invention is to provide an improved controlling mechanism for a compressor of the gasoline engine driven type. A further object of my inventionis to provide an improved controlling mechanism for a .compressor whereby the power supply to the compressor driving engine is controlled in an improved manner. A still further ob- .ject of my invention is to provide an improved controlling mechanism for a gasoline l5 engine driven compressor having improved automatic and manual speed regulating' mechanism. These and other objects -will however hereinafter morefully appear.

In the accompanying drawings I have '20 shown for purposes of illustration one em-- bodiment which my invention may assume in wheeled truck 1 including a vertical compresf sor 2 driven by a gasolinel elngine'3v and discharging into a receiver 4zthrough pipe 0.011- neotions 5, the compressor herein being supplied with usual suction inlet valves 6 which are adapted to `be held open at certain times by plungers, not shown, to unload the compressor in a well known manner. It will be observed that the motor 3 is provided with a .constant 'speed governor, generally designated 7 of the well known centrifugal weight type, herein operatively connected to a drive shaft 8 suitably driven by the 1110-.

any desired form adapted, upon a speed above or below a predetermined point, to move forward or retract a plungerlO, shown in Fig. 3, to swing an eccentric pin 11 around 5 5 a shaft or pivot 12 kto which a usual norniaL,

ytor through connections 9 which may be of i924. serial No. 716,5o's.

lyk open ported throttle valve 13 is secured.

This valve 13 is disposed in the gaseous mixture supply conduit 14 leading to the motor cylinders; and accordingly by moving the ported valve to open orclosed position, the

.speed of the motormay be increased or decreased tothe desired speed.

It will herein be noted that cooperating with thelcefntrifugal governor operated controlling mechanism is controlling mechanism of improved form which is responsive to the variation of pressure lwithin receiver'4and` which also operates the throttle valve 13.

This mechanism, generally designated 15, is adapted to be operated by receiver pressure supplied through a usual pilot valve 16 of the well known'Judspn type which is adapted. to' open at a predeterminedpressure tov supply the pressure through a pipe connection 17 and a.pipe connection 18 leading to the usual plungers 'acting on the suction inlet valves to hold the same olf their seats, unloading the compressor. At lthe same time pressure passes through a. branched Ipipe connection 19 which Vcommunicates with a steppedcylindrical` chamber o`r bore 20 to propel a piston 21 longitudinally of the cylinder; the piston herein being provided with a suitable packing washer. It will be observed that this chamber 20 is formed in a casing or housing 22 suitably supported as by bolts to a member 22 disposed between the casing 23 of the constant speed governor 7 and a member 24 lin which the eccentric pin 11 and its cooperating parts` are housed. the member 24 -herein being formed 'integral with the conduit 14. It will also be noted that the casing 22 is hereinv held in rigid non-rotative relation with the member 24 as by a key 24. The piston 21 is also adapted to be heldin its inopera tive position fby counter-pressure springs 25 suitably connected at 26 to portions formed on thecasing 22 and to a crosshead 27 suit ably'formed -on the piston 21. Within the casing 22 is mounted a lever 28 pivoted intermediate its ends on a pin 29 eccentrically located in a cylindrical plug 30 carried within a. bore 30 formed in the casing 22. One end of this lever 28 projects into .a hollowed out portion 31 formed in the piston 2 1 and is provided with a bifurcated por-k tionvpivoted at 32 to a plunger 33. Coop erating with this plunger isa coiled centripetal governor spring 34 carried by a in the air piston or plunger 21 and thus vary member 35 and held in adjusted position by a follower 36. The opposite end of this lever is suitably connected at 37 to the centrifugal governor plunger 10 which controls the position of the throttle valve 13. Suitably secured to the plug 30 is a projecting lever38 by which the plug 30 may be rotated to cause the eccentric pin 29 to assume diierent positions and ,thereby vary the compression ofthe governor spring disposed theposition of the centrifugal Weights within the governor 7 and consequently the flow of gaseous mixture to, and consequently the speed of, the gasoline operated driving engine. This lever 38 is herein adapted tobe held in its diii-erent adjusted ypositions .by means of a serrated portion formed on l7 to the right (see Fig. 3) and causing the pin 11 to be swung about its pivot 12 toy close the throttle valve 13-and decrease the supply of gaseous mixture to the engine /and consequently the speed thereof.

The operation of my improved controlling mechanism will be readily apparent from the description given, but to summarize, vit will herein be noted that when the pressure within the receiver 4 reaches a predetermined pressure, the pilot valve 16 will open, Isimultaneously admitting pressure to the plungers acting on the inlet valves to `open the latter, and to the pipe 19`leading to the cylinder 20, to move the piston A21 longitudinally and thereby swing the lever 28 about itspivot and move the plunger 10 lto swing` the valve 13 closed and decrease the speed of the engine. When, however, the pressure in the receiver drops below a 'predetermined point, the pilot valve 16 closes and exhausts the pressure behind the inlet valve unseating plungers and the governor piston 21 and causes both 'the compressor` to be loaded and the speed of the engine to be increased.

If it is desired to manually adjust the speed of the engine, the -lever 38 may be swung in either direction, thereby varying theV position of the eccentric pivot pin 29 and consequently the compression of the governor spring 34. The governor 7 of course provides means for maintaining the" speed of the engine 3 constant.

While I have in this application specilically described one embodiment which my invention may assume in practice, it will be understood that this embodiment of the same is shown .for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spiritor the scope of the appended claims.

What I claim as new and desire' to secure' means for controlling the position of said.

valve, pressure responsive means for controlling the position of said valve, and manual means including an eccentric and a cooperating lever for controlling said last mentioned means.

3. In a compressor controlling mechanism, a compressor, a driving engine therefor having a controlling valve, speed responsive means for controlling the position of said valve, pressure responsive means 'for con` trolling the position ofsaid valve, and manual means including a rotatable eccentric and operating lever for controlling said last mentioned means.

4. In a compressor controlling mechanism, a compressor, a driving engine therefor in, cluding a controlling valve, speed responsive means for controlling said valve to control said engine, and pressure responsive means including a pivoted lever cooperating with a portion of said speed' responsive means, and` manual means fory direlctly adjusting the position of said lever.

5. In a compressor controlling mechanism, a compressor, a driving engine therefor having a throttle valve, vspeed responsive means for controlling` the position of said valve including` av lever, and means for -varying the fulcrum point of said lever.

6. In a compressor controlling mechanism, a' compressor, adriving engine therefor having associatedly therewithi adjustable means for varying the speed of said engine, speed responsive means for controlling the adjustment of said means including a lever, and means for ,varying the ulcrum point oisaid lever.

V7. In a compressor controlling mechanism, a compressor, a driving engine therefor having a throttle valve, speed responsive means for controlling the position of said valve inclu-ding a spring loaded lever.,land

means for varying the fulcrum point of said lever to yvary the spring pressure on said lever.

8. In a compressor controlling mechanism R a' compressor, a driving en 'ne therefor having associated therewit adjustable means for varying the speed of said engine, speed'responsive means for controlling the adjustment of said means including a spring\ having associated therewith 10. In a compressor controlling mecha- I nism, a compressor, a driving engine therefor adJustable loaded lever, and means for varyin the fu1. means for varying the speed of said engine,

'speed responsive' means for controlling the crum point of said lever to vary t e spring pressure on said lever.

9. Ina compressor controlling mechanism, a compressor, a driving engine therefor having a throttle valve, speed responsive means for controlling the position of said valve including a spring loaded lever, and

means for varying the fulcrum point of said adjustment of said means including a spring loaded lever, and means forvarying the fulcrum point of said lever to vary the spring pressure transmitted by said lever.

In testimony whereof I aix my signature.

FRED D. HOLDSWORTH. 

